[tex] \frac{x}{7} = \frac{y}{5} = \frac{z}{11} = \frac{x + y + z}{7 + 5 + 11} = \frac{138}{23 } = \frac{6}{1} [/tex]
[tex] \frac{x}{7} = \frac{6}{1} [/tex]
x=6×7
x=42
[tex] \frac{y}{5} = \frac{6}{1} [/tex]
y=5×6
y=30
[tex] \frac{z}{11} = \frac{6}{1} [/tex]
z=6×11
z=66
